diff --git a/editor.planx.uk/src/@planx/components/shared/Preview/MapContainer.tsx b/editor.planx.uk/src/@planx/components/shared/Preview/MapContainer.tsx
index 5fff936bc9..d287cc99ed 100644
--- a/editor.planx.uk/src/@planx/components/shared/Preview/MapContainer.tsx
+++ b/editor.planx.uk/src/@planx/components/shared/Preview/MapContainer.tsx
@@ -18,6 +18,11 @@ export const MapContainer = styled(Box)<MapContainerProps>(
       // Only increase map size in Published, Preview, and Draft routes
       height:
         size === "large" && environment === "standalone" ? "70vh" : "50vh",
+      // Ensure map is not reduced to an unusable height
+      minHeight: "400px",
+      [theme.breakpoints.up("md")]: {
+        minHeight: "480px",
+      },
     },
   }),
 );